Green Power calculations

Your solar thermal system would be included in the proposed energy model and thereby reduce the overall energy use and cost. Assuming that some of the energy being offset by your solar system is electricity then the amount of electricity usage would be lower making your EAc6 purchase smaller. If your solar thermal purchase is only off-setting natural gas (or some other fossil fuel) use however, then your electricity usage would not change. So the amount of electricity you need to purchase would be based on electricity usage from the energy model after subtracting your on-site solar thermal contribution.